JPH11808A - Eccentricity correcting device for tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately correct with a simple method the eccentricity of a tool caused by both a shift of a tool shaft to a rotary axis and an angular error. SOLUTION: The first portion 2 is separably connected to the second portion 3 of a tool holder 1 via a fastening means 11, the second portion 3 is clamped to a machine tool and rotates around a rotary axis 21, and an adjusting means 27 is constituted to allow the first portion 2 of the tool holder 1 to be displaced relating to the second portion 3. An eccentricity of a tool 5 in the radial direction is corrected thereby. Two rings 14, 15 coaxial to the rotary axis 21 are rotatably arranged between the first portion 2 of the tool holder 1 and the second portion 3. These rings have ringlike faces, and one of them in inclined to the other with an accurate angle. The first portion 2 of the tool holder 1 can be inclined relating to the second portion 3 by relative rotation of the two rings to correct an angular error of the tool.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a machine tool,
In particular, it relates to a device for correcting (correcting) the eccentricity of a tool chucked on a tool carrier which is a first part of a tool holder comprising at least two parts. The first part comprises:
A second portion to be chucked to the machine tool is detachably connected to the second portion via a fastening means, and rotates around a rotation axis. The first part of the tool holder has a flange on the side facing the second part, the flange having a surface aligned at right angles to the axis of rotation and supported by the support means of the second part. The first part of the tool holder is connected to the second part via the adjusting means.
The part can be displaced (moved).

[0002]

The eccentricity of a tool chucked on a tool carrier of a two-part tool holder that is chucked on a machine tool and rotates around a rotation axis is, on the one hand, that the tool axis is the rotation axis of the tool holder. This is caused by shifting (deviation) with respect to. On the other hand, such eccentricity of the tool may be caused by the fact that, in addition to the above, the tool axis is inclined with respect to the axis of rotation (meaning that there is an angular error), or by the inclination alone.

[0003] For example, Japanese Patent No. 2049125 discloses an apparatus for displacing (moving) a shaft of a tool held by a two-part tool holder. The two holder parts are connected to each other by a fastening screw of a flange connection. As described above, the adjusting means is configured such that one of the holder portions includes the set screw (set screw) screwed into the setting ring (adjustment ring) rotatably guided on the cylindrical peripheral wall surface of the other holder portion. Is displaced with respect to the other part. For this purpose, the set screw can be rotated after loosening the fastening means, thereby producing the required displacement of one holder part relative to the other.

[0004] One drawback of the device is that it allows for parallel displacement (movement) of the tool, but does not allow for adjustment of the angular error of the tool. Another drawback of the device is that the diameter of the tool holder increases due to the setting ring (adjustment ring) which slides on the cylindrical peripheral wall of the two holder parts of the tool holder.

[0005] For the purpose of adjusting the angle error, the two-part tool holder is also constituted by adding a set screw in addition to a fastening screw. One of the holder parts of the tool holder is supported by the set screw of the other holder part. Thus, by adjusting the set screw, the angular position of one holder portion with respect to the other can be achieved. However, after all, such devices cannot correct eccentric deviations in the form of angular errors of the tool in a reproducible manner.

In particular, it is known that accurate adjustment is desired in the case of a guide reamer or a multi-stage (multi-stage) reamer, in which connection both of the above-mentioned eccentricities should be corrected. It is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple means for correcting the eccentricity of a tool caused by both a shift (deviation) of a tool axis with respect to a rotation axis of a machine tool and an angle error of the tool axis with respect to a rotation axis of the machine tool. Thus, an improved device is provided.

[0008]

For this purpose, in the device according to the invention, the support means comprises a first ring and a second ring each having two flat annular surfaces. Each ring is substantially coaxial with the axis of rotation and rotatably arranged about the axis of rotation between the first and second portions of the tool holder, one of the annular surfaces of each ring being a respective one of the respective annular surfaces. The ring is inclined at a predetermined angle with respect to the other annular surface.

The first part of the tool holder has a flange on the side facing the second part, and the flange is supported via the support means of the second part, so that the first part is connected to the second part. On the other hand, it can be displaced in the radial direction of the rotation axis, thereby enabling a parallel displacement of the tool axis. Furthermore, the support means is comprised of two rings, one placed on top of the other, each ring advantageously having an annular surface lying against and in contact with each other, each at an angle α. Being inclined, a change in the angular position of the tool axis with respect to the rotation axis can be achieved by rotation of one of the rings with respect to the other.

The two rings are preferably arranged in a channel recess in the second part of the tool holder, one of the two rings having a full-length protruding collar on the inner diameter. The other ring rests on the collar in such a way that its inner peripheral surface rests on the outer peripheral surface of the collar. by this,
The relative rotation or rotation of the two rings is optimally achieved.

In order to prevent the inclination of the other ring, which is mounted on the collar of one ring, by the inclined surface due to the rotation of one ring relative to the other, it must be guided substantially without play. The outer peripheral surface of the collar is convex.

The two rings are provided with releasable stops so that the relative rotation or rotation of the two rings is not a problem. The two rings are preferably
A scale is provided around its circumference so that the mutual position of each of the two rings (as well as the position relative to the second part of the tool holder) can be easily measured and the required position can be set.

The screw, which acts as a fastening means, must be loosened to correct the eccentricity and also to prevent unintended shifting, so that the spring washer is provided with a screw head and the second of the tool holder. Mounted between the two parts, thereby providing a bias and allowing adjustment.

The adjusting means for displacing the first part of the tool holder with respect to the second part is designed in such a way that it is mounted on the tool holder to correct the eccentricity and can be removed again. This has the advantage that the adjusting means can be used for tool holders of different diameters.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the tool holder 1 includes a first part 2 and a second part 3. Second
The part 3 is chucked in a manner known per se, for example by means of a tapered sleeve 4, to a machine tool (not shown). A tool 5, for example a reamer, is inserted into the first part 2 and held there by a fastening bolt 6.

The first part 2 and the second part 3 of the tool holder 1
Means that flanges are formed on the side surfaces facing each other. First
The surface 8 of the flange 7 of the part 2 is supported on support means 9 which is inserted into the channel recess 10 of the second part 3 when assembling the tool holder 1. The first part 2 and the second part 3 are fastened together by a screw 11, a fastening means in the form of a spring washer 13 mounted between the head of the screw 11 and the first part 2. The surface 8 and the support means 9 substantially rotate around a rotation axis 21 around which the tool holder 1 rotates with the tool 5 when being chucked to the machine tool.
Aligned at right angles to 1.

As shown more clearly in FIG. 2, the support means 9 includes a first ring 14 and a second ring 15. The first ring 14 is provided with a collar 16 projecting all around its inner diameter. The second ring 15 is arranged such that its inner peripheral surface rests on the outer peripheral surface of the collar 16,
Sliding up. The outer peripheral surface of the collar 16 is slightly convex.

The first ring 14 has a first annular surface 17 and a second annular surface 18, while the second ring 15 also has a first annular surface 19 and a second annular surface 20. 1st ring 1
4 and the second annular surface 1 of the second ring 15
9 is leaning on each other. Second annular surface 1
8 is inclined toward the first annular surface 17 of the first ring 14. The first annular surface 19 is likewise connected to the second ring 1
5 with respect to the second annular surface 20 by the same amount. This slope is very slight, for example for a 100 mm outer diameter of the two rings 14 and 15 the slope is about 0.1
mm, which corresponds to an angle α of about 0.06 °.

As shown in FIG. 1, two rings 14
And 15 are rotatable about a rotation axis 21. For this purpose, they each have an inner diameter 22, into which a suitable tool is inserted. The two rings 14 and 15 can be rotated individually or jointly. They are set screws 23
Is locked by

The second part 3 of the tool holder 1 is
4 is included. The cylindrical region 25 closed on the side close to the tapered sleeve 4 by the annular rim 26
Is adjacent to

The adjusting means 27 is inserted into the cylindrical area 25. The adjusting means 27 comprises a holding part 28 with a cam 29
And the cam 29 is located in the groove 24 when inserted as shown in FIG. The holding part 28 is thus supported on the cylindrical area 25 of the second part 3 of the tool holder 1.

The holding part 28 has a projection 31 extending on the first part 2. The projection 31 includes a through hole 32 provided with a screw portion, into which a threaded bolt 33 having a rotating handle 34 is screwed. The through hole 32 of the projection 31 is provided with a bolt 33 with a screw.
It is arranged to act on the flange of the part 2.

Mounted in the area of the tool 5 inserted in the tool holder 1 is a support for holding two measuring means 36, for example a dial gauge having a measuring element spaced apart by a distance D and in contact with the tool 5. The frame 35 is shown. The support frame 35 is separably fixed to the machine tool by a method not shown.

FIG. 3 is a front view of the tool holder 1.
The first part 2 with the tool 5 inserted in the first part 2 and held by the fastening bolt 6 is shown. Similarly, the first
Also shown is a screw 11 for fastening the part 2 to a second part (not shown) of the tool holder 1. In addition, the holding part 2
Also shown is an adjusting means 27 including a threaded bolt 33 with 8, a projection 31 and a rotating handle 34.

As shown in FIG. 1, when the tool 5 is inserted into the tool holder 1, the tool 5 is adjusted at that time. For this purpose, two measuring means 3 are located in the position shown in FIG.
6 is provided.

As illustrated diagrammatically in FIG. 4, the chucked tool shaft 37 is somewhat exaggerated in FIG. 4 or is inclined with respect to the axis of the rotary shaft 21 of the tool holder 1. The first part 2 is exactly the second part 3 of the tool holder 1
The first ring 14 and the second ring 15
Are positioned relative to each other. For even better understanding, the slope of each face of the rings 14 and 15 (indicated by the angle α) is exaggerated in size. Rings 14 and 15
Can be checked by the scale appearing thereon (see FIG. 1), when the zero markings of the two scales match, the first part 2
And the second part 3 are parallel. The fastening screw is then screwed in until the spring washer 13 is compressed.

With the help of the measuring means arranged closest to the tool holder 1, the concentric or precise movement of the tool is adjusted at this point. Therefore, the largest eccentric run-out of the tool indicated on the measuring means is brought to a position facing the measuring means. The adjusting means 27 is arranged on the tool holder 1 as shown in FIG.
Is pressed against the first part 2 by the rotating handle 34 and until the tool moves accurately near the measuring means described above.
The part 2 is displaced (moved) with respect to the second part 3. FIG.
With respect to this, this means that the tool axis 37 is shifted towards the rotation axis 21 until the tool axis 37 intersects the rotation axis 21 near the measuring means described above.

If there is also an angle error, as assumed in the illustration of FIG. 4, the measuring means 36 (see FIG. 1) remote from the tool holder 1 will show eccentricity. This eccentricity
Once the maximum deflection has been directed in the direction of the measuring means 36 further from the tool holder 1, it is corrected once again. Second
The ring 15 can then be rotated with respect to the first ring 14. The scale on the two rings 14 and 15 is adjusted to match the scale of the measuring means 36 remote from the tool holder 1. In this way, the second ring 15 is rotated by the scale of the corresponding scale due to the above-mentioned swing of the measuring means. Second ring 15
Is then locked to the first ring 14, which together with the second ring 15 are two rings 14 and 1
5 is rotated relative to the second part 3 of the tool holder 1 to a position where the above-mentioned measuring means shows the greatest eccentricity.
The first ring 14 is then locked as well.

As a result, the adjustment shown schematically in FIG. 5 is achieved. At that time, the axis 37 of the tool is parallel to the rotation axis 21. The two measuring means 36 now show the same eccentricity of the tool. The adjusting means 27 may then be placed on the tool holder 1 again in a position which is aligned with the measuring means when the measuring means shows a maximum eccentric runout.
As already mentioned above, the first part 2 of the tool holder
Is displaced (moved) with respect to the second part 3 until the tool axis 37 coincides with the rotation axis 21, as shown in FIG.
The screw 11 is then completely tightened, the adjusting means 27 is removed and the support frame 35 (FIG. 1) with the measuring means 36 is also removed.

As already mentioned, the scale on the second ring 15 preferably corresponds to the scale of the measuring means 36 (FIG. 1). If the distance D between the two measuring means
Is equal to the diameter D1 of the two rings 14 and 15, this is the inclination of the tool 5 between the two measuring means 36 when the first part 2 of the tool holder is inclined by 0.2 mm. Is also 0.2 mm. Instead, if the distance D is different, of course, then the scale on the second ring 15 is modified accordingly.

As described above, according to the apparatus according to the present embodiment, since both the eccentricity in the radial direction and the angle error can be corrected, the tool in the tool holder can be accurately adjusted.

[0033]

According to the apparatus according to the present invention, the tool caused by both the shift (deviation, radial eccentricity) of the tool axis with respect to the rotation axis of the machine tool and the angle error of the tool axis with respect to the rotation axis of the machine tool. Can be easily and accurately corrected.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view of an apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing two rings of the device of FIG. 1;

FIG. 3 is a front view of an adjustment element when set on a tool holder in the embodiment.

FIG. 4 is a diagram of an eccentric tool in the embodiment.

FIG. 5 is a diagram of the same tool as in the first embodiment in which an angle error has been corrected.

FIG. 6 is a diagram of an apparatus having a fully adjusted tool according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool holder 2 1st part 3 2nd part 7 Flange 8 Surface 9 Supporting means 10 Groove type recess 11 Fastening means 13 Spring washer 14 First ring 15 Second ring 16 Fully protruding collar 17-20 Annular surface 21 Rotating shaft 23 Stopping means 24 Entire circumferential groove 27 Adjusting means 28 Holding part 29 Cam 31 Projection 32 Threaded hole 33, 34 Adjusting element

Claims (11)

[Claims] 1. An eccentricity correction device for a tool (5), said tool (5) being chucked to a tool carrier of a first part (2) of a tool holder (1) consisting of at least two parts, The first part (2) is a second part which can be chucked to the machine tool.
The first part (2) of the tool holder (1) is connected to the part (3) in a detachable manner via a fastening means (11) and rotates around a rotation axis (21). On the side facing (3), there is a flange (7), which has a surface (8) arranged at right angles to the axis of rotation (21) and supports the second part (3). 9), and the first part (2) of the tool holder (1) is displaceable with respect to the second part (3) via the adjusting means (27); ) Comprises a first ring (14) and a second ring (15), each ring having a flat annular surface (17, 18 and 1).
9, 20), the ring (14, 15) being substantially between the first part (2) and the second part (3) about the axis of rotation (2,
1) and rotatable about the axis of rotation (21), one of the annular surfaces (18, 19) of the rings (14, 15) being one of the other annular surfaces (17) of the respective ring. , 2
An eccentricity correcting device for a tool, characterized by being inclined at a predetermined angle (α) with respect to 0). 2. The annular surfaces (18, 19) of said two rings (14, 15), which are in contact with each other, are each inclined, the angle (α) of which is approximately 0.1 °. The eccentricity correcting device for a tool according to claim 1, wherein the device has a size. 3. The tool according to claim 1, wherein the two rings are arranged in a channel recess of the second part of the tool holder. Item 2
An eccentricity correcting device for a tool according to claim 1. 4. One of the two rings (14) has a full-length projecting collar (16) on the inside diameter and the other ring (15).
Is slid over the collar (16) in such a way that the inner peripheral surface rests on the outer peripheral surface of the collar (16). An eccentricity correction device for a tool according to the above. 5. The eccentricity correcting device for a tool according to claim 4, wherein an outer peripheral surface of the collar is a convex surface. 6. The two rings (14, 15) are provided with releasable stop means (23) and means (2, 5) such that the two rings (14, 15) are rotated by a rotating tool.
The eccentricity correcting device for a tool according to any one of claims 1 to 5, further comprising (2). 7. The eccentric correction of a tool according to claim 1, wherein at least one of the two rings has a scale around it. apparatus. 8. When the fastening means takes the form of a screw (11), the spring washer (13) comprises: a head of the screw (11);
The eccentricity correcting device for a tool according to any one of claims 1 to 7, wherein the device is mounted between the first portion (2) of the tool holder (1) and the first portion (2). 9. The adjusting means (27) comprises a holding part (28).
The holding part (28) is arranged on the second part (3) of the tool holder (1) and comprises an adjusting element (33, 34) and comprises a second part (28). After displacement of the first part (2) of the tool holder (1) with respect to 3)
The eccentricity correcting device for a tool according to any one of claims 1 to 8, wherein the device can be removed. 10. The holding part (28) comprises a cam (29) insertable into a circumferential groove (24) formed in the second part (3) of the tool holder (1) and the holding part (28). 2) comprises a projection (31) extending on the two parts (2, 3) of the tool holder (1) when the tool holder (1) is stationary, and said adjusting element (33, 3).
10. An eccentricity correcting device for a tool according to claim 9, wherein 4) is arranged on the projection (31) and acts on the first part (2). 11. The adjusting element has a corresponding threaded hole (3).
2) comprising a threaded bolt (33) which can be screwed on, wherein said hole (32) is aligned substantially perpendicular to the axis of rotation (21) and said threaded bolt (3)
Device according to claim 9 or 10, characterized in that 3) comprises a rotary handle (34).